29991943 has 2 divisors, whose sum is σ = 29991944. Its totient is φ = 29991942.

The previous prime is 29991919. The next prime is 29991979. The reversal of 29991943 is 34919992.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 29991943 - 2¹⁷ = 29860871 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 29991893 and 29991902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29991343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14995971 + 14995972.

It is an arithmetic number, because the mean of its divisors is an integer number (14995972).

Almost surely, 2^29991943 is an apocalyptic number.

29991943 is a deficient number, since it is larger than the sum of its proper divisors (1).

29991943 is an equidigital number, since it uses as much as digits as its factorization.

29991943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 46.

The square root of 29991943 is about 5476.4900255547. The cubic root of 29991943 is about 310.6954314689.

The spelling of 29991943 in words is "twenty-nine million, nine hundred ninety-one thousand, nine hundred forty-three".